Grinding-machine.



L. W. BUGBEE.

GRINDING MACHINE.

APPLlCATlON FILED ocT. 7. 1916.

Patented Dec. 19, 1916.

v ill Ill/MENTOR LQOA/Y w EUGBEE FATS LUCIAN W. BUG-BEE, 0F SOUTHIBRIDGE, MASSACHUSETTS, ASSIGNOR TO AMERICAN OPTICAL COMPANY, 0F SOUTHBRIDGE, MASSACHUSETTS, A VOLUNTARY ASSOCIA- TION OF MASSACHUSETTS.

' T 0 all whom 2'25 may concern."

Be it known that I, LUCIAN W. BUGBEE, a citizen of the United States, residing at Southbridge, in the county of Worcester and a State of Massachusetts, have invented cer tain new and useful Improvements in GrindingeMa chines, of which the following is a specification.

This invention relates to improvements in grinding machines and has particular reference to a novel and improved machine for use in the grinding or polishing of ophthalmic lenses.

One of the leading objects of the present invention is the provisionof a simply constructed machine for use in the grinding or polishing of ophthalmic lenses, which may be either manually or automatically operated at the will of the operator, and in which the automatic means will substantially imitate themanual operation of the machine and thus secure the most perfect grinding or polishing of the lens.

A further object of the present invention is the provision of an improved form of automatic lens grinding or polishing machine,

in which the zone of movement of the lensrelative to the tool may be readily varied as desired, and in which the limits of the particular zone may also be varied.

Other objects and advantages of my improved grinding machine should be readily apparent by reference to the following specification taken in connection with the accompanying drawings forming a part thereof, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a vertical sectional view through the main portion of my machine. Fig."'II represents a top plan view thereof. Fig. III represents a sectional view taken substantially at right angles to Fig. I. Fig. IV represents a detailed sectional view.

Inv the drawings, in which similar char acters of reference are employed to denotecorresponding parts throughout the several views, the numeral 1 designates a base or pedestal of my improved grinding machine, which I have illustrated as having rotatably mounted therein the motor rotor 2, whose shaft 3 projects upwardly above the pedes- Specification of Letters latent.

GRINDING-MACHINE.

Patented Dec. 19, 11216.

' Application filed October 7, 1916. Serial No. 124,284.

tal in the space inclosed by the tub 4 and is provided on its upper end with the shield member 5 inclosed within said tub. Projecting above the shield member 5 and axial with the spindle 3 is the tapered tenon 6 adapted to tightly fit within the tapered socket 7 of the grinding tool 8, if desired the tenon being further provided with a pin 10 fitting within a slot 11 to insure rotation of the tool with the spindle.

The top of the tub 4 is provided with a circumferential projecting flange 12 and has inclosed therewithin the cylindrical supplemental tub wall 13, while formed at one side of the tub 4 is the vertical flange extension 14 for attachment of the lens guiding member. Fitting around the flange 12 on the tub and the flange-member 14 are the arms 15 of the casting 16, which arms are held in tight clamping engagement with the side of the tubes by the set screw 17. The casting is centrally bored to receive the bar 18 held in adjusted position as by the stud screw 19 and having on its upper end the swiveled cap'20 terminating in the pivot ears 21, between which is pivotally secured the sleeve or bracket 22. This bracket 22 has alined therewith the brace sleeve member 23, the said parts being connected by the plate 24 having a series of apertures 25 therein arran ed at different distances from the axis of the sleeve.

Passing through the sleeve and suitably secured therein is the lens shifting rod 26 bearing the lens engaging pin 27 and having on its outer end the handle portion 28 which may be manually grasped. to suitably shift the bar and thus the lens block 29 and lens 30 relative to the grinding tool 8. It will be noted that I have shown the rod 26 as secured by the thumb screw or like adjustable locking device 31 permitting of adjustment of. the member 26 relative to the sleeve as desired, while the pivotal connection between the swivel cap 20 and bracket ment of this result in connection with my improved machine I form on the pedestal 1 the projecting bracket 32 having the bearing 33, in which is journaled the shaft 34 having on one end the pulley 35 suitably driven as from the shaft 3 through the me dium of the driving belt 36 and having on its other end the disk 37 bearing the stud shaft or eccentric pin 38 having rotatably mounted thereon the sleeve 39 to which is pivoted the yoke 40, bearing a second sleeve 41. This sleeve 41 has adjustably mounted disk 37 on account of the eccentric positioning of the stud 38 will impart a. horizontal reciprocating movement to the link 42 and thus through the pin and plate connection a similar reciprocating movement to the member 26 swinging about the swivel cap 20 on the member 18 as a center, and consequently a greater amount of reciprocating movement will be imparted through the lens pin 27 to the block 29. The width of'the zone of this movement, it will be understood, is controlled by the selective engagement between the. pin 43 anddesiredaperture 25,-

in that the farther the aperture is located from the center of pivotance of the member 26, the less the width of zone traversed by the pin 27 and lens, while the nearer the pin 43 is disposed to the ,point of pivotance, the greater will be the width of the zone of movement, Likewise, the exactmosition of the zone or series of zones may be controlled by adjusting the combined length of the yoke 40 and pin 42, as by sliding of thelink through the sleeve and locking in adjusted position'in the sleeve. In this connection it will be noted that I have illustratedand preferably formed the apertures or sockets 7 operation the automatic means while the 25 at varying differences from the member 26, the said sockets 25, as a matter of fact being arranged in arcuate form about the pivot axis of the yoke 40 as a center, con sidering that yoke at its innermost limit of movement. The essential purpose of this arrangement is to avoid the machine being so adjusted that the pin 27 will pass across the center of the grinding tool when a change is made by engaging'the bearing point 43in different sockets. By this arcuate arrangement about the pivotal center of. the yoke, in its forwardly extended position as a center it will thus be seen that the pin 43 may be selectively engaged in any'desired aperture without in anywise varying the innermost limit of movement of the united to properly fit the ball, preferably to an aperture, although either might ,be employed.

The advantage of the ball and socket, how-' ever, lies in the facilitation of the rocking movement of the link 42 as the eccentric 37 rotates, which might otherwise cause .a

slight binding engagement between the pin and plate.

I would further invite particular attention to the upstanding lugs 45 -on the sleeve 22, these lugs 45 being spaced apart in the form of a yoke adapted to receive therebetween the rod 42 when it is desired to swing'the same out of engagement with the plate 24 to permit of manual or other shifting of the. rod 26, the yoke thus'provided satisfactorily retaining the link 42 without the necessity of stopping the rotation'of the eccentric'37.

From-the preceding description, the construction of my improved grinding machine should be readily understood, and it will;

be noted that I have provided. an improved 'machine embodying essentially a rotating grinding tool in connection with a block looselysupported above the lap or grinding tool, in connection withmeans for either manually or automatically imparting a. movement to the block across the face of the grinding tool, and further that I have providednoveland improved means for readily accomplishing this'movement automatically, have provided means which may be applied to various forms of known lens grinding machines, and have provided means which are capable of instant adjustments to vary the thi'ow'for to disconnect and hold out of manually shifting means are employed.

I claim:

1. In a lens grinding machine, the com bination with a support and a1 vertically mounted spindle carried by the support, of

' a post rising'fr'om the support, anarm pivotally supported by the post for swinging movement in a horizontal plane, the arm.

'having a pin for cooperation with a lens regulating the oscillation of the am about its pivotal support. I

2. In a grinding-machine, the combination with a rotatable spindle and a lens block disposed above the spindle, of a pivotally supported arm having a pin engaging the block and a bracket provided with a series of arcuately disposed sockets, anda recip- 'roc'ating member having a pin for selective engagement in the sockets for reciprocating the arm and lap relative to the grinding spindle, the selective engagement of the pin in different apertures varying the, amplitude of the reciprocations, substantially as described. 3. In a device of the character described, the combination with an oscillatable arm, of a reciprocating link, the arm having a bracket provided with an arcuate series of sockets arranged about the distant end of the link in its proximate position as a center, and means on the link for selectively engaging the several Sockets to vary the outward limit of movement of the arm while maintaining a constant limit of inner movement for the arm.

4:. In a machine of the character described, the combination with an oscillatable arm, of a bracket carried by the arm, a reciproeating yoke and a link extending from the having a sleeve portion pivotally connected to the po%, said sleeve having a pair of projections forming a seat therebetween and having a socketed laterally extending bracket integral therewith, and a reciprocating member on the support adapted for se lective engagement with the bracket or the seat, substantially as and for the purpose described.

In testimony whereof I affix my signature in the presence of two witnesses.

LUCIAN W. BUGBEE. Witnesses:

H. K. PARSONS, E. M. HALVORSEN. 

